3.3. Rock Magnetism Results
According to the High Temperature Magnetic Susceptibility measurements, the transition of maghemite to magnetite can be seen with an increase in susceptibility values at approximately 250-350 °C (Fig. 9). The samples have a Curie temperature between 530-550 °C which may be a sign of titanium in the minerals and of a new sulphite phase created from decomposing the maghemite and incorporation of the sulfur from the surrounding clay. The increase of susceptibility values in the cooling curves corresponds to the percentage of maghemite decrease after the heating in the samples (Fig. 9a, c, d). Two different drops in susceptibility values at 410 °C and 530 °C in Fig. 9c shows the existence of maghemite and magnetite together in the sample.